Bearing down on grizzlies | Science Matters | David Suzuki Foundation
Photo: Bearing down on grizzlies

Grizzlies are essential components of the ecosystems where they live. They help to disperse seeds and nutrients throughout the forest, and because they eat both plants and animals, they have a significant "top-down" influence on the food web (Credit: Barbra Miers via Flickr).

By David Suzuki with Faisal Moola

Years ago, I was surprised to learn that a grizzly bear is protected in the United States, but if it walks across the border into British Columbia, it can be killed for sport. So we did a program on them for The Nature of Things. I was amazed to see pictures from the 1800s of immense piles of skulls from grizzlies that were slaughtered to make room for early settlers on the prairies. Grizzlies were not just mountain animals; they flourished on bison all the way across Canada to Manitoba and south to Texas and California (where the only place you'll find one now is on the state flag)! Grizzlies need space — tagged animals have been known to travel over hundreds of kilometres in a season. But the cumulative impacts of habitat loss and fragmentation from logging, mining, road building, urbanization, and other land-use pressures have forced them into isolated patches of territory.

The U.S. Endangered Species Act lists the grizzly as "threatened", meaning it is in danger of becoming extinct. Grizzly bears in Canada are ranked as "special concern" by Canada's scientific committee on species at risk (the Committee on the Status of Endangered Wildlife in Canada, or COSEWIC) but remain legally unprotected. In the absence of legal protection, they continue to be hunted unsustainably in B.C. Government statistics show that 430 grizzlies were killed in the province in 2007, and close to 11,000 have been killed since 1975.

Last year's kill in B.C. was a record, something we only found out when environmental groups, including the David Suzuki Foundation, were able to pry the information from the government. Most of the bears — about 88 per cent — were killed for sport. The rest were killed by poachers and animal-control officers.

The B.C. government argues that the grizzly hunt is sustainable, but the methods by which it estimates the numbers of bears are imprecise. In fact, many leading bear biologists say the B.C. government's numbers — about 17,000 grizzlies — are high and that the number may be as low as 6,000. When scientists and researchers are unable to determine accurate population numbers, they often rely on the precautionary principle to ensure sustainable management. This is the idea that when potential risks exist, it's better to be safe than sorry. In other words, if we suspect that grizzly populations are imperilled, we should stop killing them, even if we aren't yet 100 per cent certain about the existing population size or rate of decline.

Some might ask why we should protect the grizzly. After all, it's a large, dangerous animal that has been known to kill humans and livestock. But the dangers are exaggerated: grizzlies tend to be more afraid of than threatening to people, and their impact on livestock is minimal. More importantly, grizzlies are essential components of the ecosystems where they live. They help to disperse seeds and nutrients throughout the forest, and because they eat both plants and animals, they have a significant "top-down" influence on the food web. When salmon are spawning, grizzlies carry the fish into the forests to eat them, leaving much of the carcass behind. Those salmon remains feed many other birds, mammals, invertebrates, and microorganisms, and the nutrients in the rotting carcasses fertilize the surrounding trees. It's a marvelous story of interconnections and interdependence.

The B.C. government has made some progress in grizzly conservation by setting aside some of its habitat, including the Great Bear Rainforest, as protected areas. But even there, trophy hunting is allowed, and many of the parks and protected areas are likely too small and isolated to maintain the grizzlies' long-term survival. For this reason, the way we manage the rest of its territory is critical. As a start, the B.C. government must suspend the controversial grizzly hunt, as Alberta recently did, and must continue to protect large areas of grizzly habitat from resource development, roads, and other human pressures. British Columbia is unique in that grizzlies still inhabit much of the province, even though they have been eliminated from almost all of their historical territory across the planet. That means we have a global responsibility to protect this iconic carnivore.

May 2, 2008
http://www.davidsuzuki.org/blogs/science-matters/2008/05/bearing-down-on-grizzlies/

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